Tracking the market and economic trends that shape your finances.

As the nation's baby boomers sign up for Medicare, they face a bewildering assortment of questions about their healthcare.

In addition to a raft of complicated information from the government, a national consumer group also is offering some answers.

Consumers Union, the nonprofit publisher of Consumer Reports, has produced a free guide about changes this year to the federal government's insurance program for the elderly under the new national healthcare law.

It lists, for example, the many preventive medical services that are fully covered under the law for those in the original Medicare program. These include prostate and colon cancer screenings, mammograms, flu shots and pneumonia vaccinations.

The guide also explains how prescription drug costs will decrease once Medicare beneficiaries reach the so-called doughnut hole -- the point in Medicare drug plans at which beneficiaries have paid the full amount in the past for medications.

"Whether you have Medicare, you're about to be eligible, or have a loved one in the program, the guide helps you sort through what's new in today's system," said Jim Guest, president of Consumers Union.